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Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 3(365), p. 712-726

DOI: 10.1111/j.1365-2966.2005.09797.x

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The properties of Ly emitting galaxies in hierarchical galaxy formation models

Journal article published in 2006 by M. Le Delliou, C. G. Lacey ORCID, C. M. Baugh, S. L. Morris
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We present detailed predictions for the properties of Lyα-emitting galaxies in the framework of the Λ cold dark matter cosmology, calculated using the semi-analytical galaxy formation model galform. We explore a model that assumes a top-heavy initial mass function in starbursts and that has previously been shown to explain the sub-millimetre number counts and the luminosity function of Lyman-break galaxies at high redshift. We show that this model, with the simple assumption that a fixed fraction of Lyα photons escape from each galaxy, is remarkably successful at explaining the observed luminosity function of Lyα emitters (LAEs) over the redshift range 3 7, a redshift range that is starting to be be probed by near-infrared surveys and using new instruments such as the Dark Ages Z Lyman Explorer (DAzLE).